1/*	$NetBSD: readline.c,v 1.92 2010/09/16 20:08:51 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1997 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jaromir Dolecek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33#if !defined(lint) && !defined(SCCSID)
34__RCSID("$NetBSD: readline.c,v 1.92 2010/09/16 20:08:51 christos Exp $");
35#endif /* not lint && not SCCSID */
36
37#include <sys/types.h>
38#include <sys/stat.h>
39#include <stdio.h>
40#include <dirent.h>
41#include <string.h>
42#include <pwd.h>
43#include <ctype.h>
44#include <stdlib.h>
45#include <unistd.h>
46#include <limits.h>
47#include <errno.h>
48#include <fcntl.h>
49#include <setjmp.h>
50#include <vis.h>
51#include "editline/readline.h"
52#include "el.h"
53#include "fcns.h"		/* for EL_NUM_FCNS */
54#include "histedit.h"
55#include "filecomplete.h"
56
57#if !defined(SIZE_T_MAX)
58# define SIZE_T_MAX (size_t)(-1)
59#endif
60
61void rl_prep_terminal(int);
62void rl_deprep_terminal(void);
63
64/* for rl_complete() */
65#define TAB		'\r'
66
67/* see comment at the #ifdef for sense of this */
68/* #define GDB_411_HACK */
69
70/* readline compatibility stuff - look at readline sources/documentation */
71/* to see what these variables mean */
72const char *rl_library_version = "EditLine wrapper";
73int rl_readline_version = RL_READLINE_VERSION;
74static char empty[] = { '\0' };
75static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
76static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
77    '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
78char *rl_readline_name = empty;
79FILE *rl_instream = NULL;
80FILE *rl_outstream = NULL;
81int rl_point = 0;
82int rl_end = 0;
83char *rl_line_buffer = NULL;
84VCPFunction *rl_linefunc = NULL;
85int rl_done = 0;
86VFunction *rl_event_hook = NULL;
87KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
88    emacs_meta_keymap,
89    emacs_ctlx_keymap;
90
91int history_base = 1;		/* probably never subject to change */
92int history_length = 0;
93int max_input_history = 0;
94char history_expansion_char = '!';
95char history_subst_char = '^';
96char *history_no_expand_chars = expand_chars;
97Function *history_inhibit_expansion_function = NULL;
98char *history_arg_extract(int start, int end, const char *str);
99
100int rl_inhibit_completion = 0;
101int rl_attempted_completion_over = 0;
102char *rl_basic_word_break_characters = break_chars;
103char *rl_completer_word_break_characters = NULL;
104char *rl_completer_quote_characters = NULL;
105Function *rl_completion_entry_function = NULL;
106CPPFunction *rl_attempted_completion_function = NULL;
107Function *rl_pre_input_hook = NULL;
108Function *rl_startup1_hook = NULL;
109int (*rl_getc_function)(FILE *) = NULL;
110char *rl_terminal_name = NULL;
111int rl_already_prompted = 0;
112int rl_filename_completion_desired = 0;
113int rl_ignore_completion_duplicates = 0;
114int rl_catch_signals = 1;
115int readline_echoing_p = 1;
116int _rl_print_completions_horizontally = 0;
117VFunction *rl_redisplay_function = NULL;
118Function *rl_startup_hook = NULL;
119VFunction *rl_completion_display_matches_hook = NULL;
120VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
121VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
122KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
123
124/*
125 * The current prompt string.
126 */
127char *rl_prompt = NULL;
128/*
129 * This is set to character indicating type of completion being done by
130 * rl_complete_internal(); this is available for application completion
131 * functions.
132 */
133int rl_completion_type = 0;
134
135/*
136 * If more than this number of items results from query for possible
137 * completions, we ask user if they are sure to really display the list.
138 */
139int rl_completion_query_items = 100;
140
141/*
142 * List of characters which are word break characters, but should be left
143 * in the parsed text when it is passed to the completion function.
144 * Shell uses this to help determine what kind of completing to do.
145 */
146char *rl_special_prefixes = NULL;
147
148/*
149 * This is the character appended to the completed words if at the end of
150 * the line. Default is ' ' (a space).
151 */
152int rl_completion_append_character = ' ';
153
154/* stuff below is used internally by libedit for readline emulation */
155
156static History *h = NULL;
157static EditLine *e = NULL;
158static Function *map[256];
159static jmp_buf topbuf;
160
161/* internal functions */
162static unsigned char	 _el_rl_complete(EditLine *, int);
163static unsigned char	 _el_rl_tstp(EditLine *, int);
164static char		*_get_prompt(EditLine *);
165static int		 _getc_function(EditLine *, char *);
166static HIST_ENTRY	*_move_history(int);
167static int		 _history_expand_command(const char *, size_t, size_t,
168    char **);
169static char		*_rl_compat_sub(const char *, const char *,
170    const char *, int);
171static int		 _rl_event_read_char(EditLine *, char *);
172static void		 _rl_update_pos(void);
173
174
175/* ARGSUSED */
176static char *
177_get_prompt(EditLine *el __attribute__((__unused__)))
178{
179	rl_already_prompted = 1;
180	return (rl_prompt);
181}
182
183
184/*
185 * generic function for moving around history
186 */
187static HIST_ENTRY *
188_move_history(int op)
189{
190	HistEvent ev;
191	static HIST_ENTRY rl_he;
192
193	if (history(h, &ev, op) != 0)
194		return (HIST_ENTRY *) NULL;
195
196	rl_he.line = ev.str;
197	rl_he.data = NULL;
198
199	return (&rl_he);
200}
201
202
203/*
204 * read one key from user defined input function
205 */
206static int
207/*ARGSUSED*/
208_getc_function(EditLine *el, char *c)
209{
210	int i;
211
212	i = (*rl_getc_function)(NULL);
213	if (i == -1)
214		return 0;
215	*c = i;
216	return 1;
217}
218
219static void
220_resize_fun(EditLine *el, void *a)
221{
222	const LineInfo *li;
223	char **ap = a;
224
225	li = el_line(el);
226	/* a cheesy way to get rid of const cast. */
227	*ap = memchr(li->buffer, *li->buffer, 1);
228}
229
230static const char _dothistory[] = "/.history";
231
232static const char *
233_default_history_file(void)
234{
235	struct passwd *p;
236	static char path[PATH_MAX];
237
238	if (*path)
239		return path;
240	if ((p = getpwuid(getuid())) == NULL)
241		return NULL;
242	strlcpy(path, p->pw_dir, PATH_MAX);
243	strlcat(path, _dothistory, PATH_MAX);
244	return path;
245}
246
247/*
248 * READLINE compatibility stuff
249 */
250
251/*
252 * Set the prompt
253 */
254int
255rl_set_prompt(const char *prompt)
256{
257	char *p;
258
259	if (!prompt)
260		prompt = "";
261	if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
262		return 0;
263	if (rl_prompt)
264		free(rl_prompt);
265	rl_prompt = strdup(prompt);
266	if (rl_prompt == NULL)
267		return -1;
268
269	while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
270		*p = RL_PROMPT_START_IGNORE;
271
272	return 0;
273}
274
275/*
276 * initialize rl compat stuff
277 */
278int
279rl_initialize(void)
280{
281	HistEvent ev;
282	int editmode = 1;
283	struct termios t;
284
285	if (e != NULL)
286		el_end(e);
287	if (h != NULL)
288		history_end(h);
289
290	if (!rl_instream)
291		rl_instream = stdin;
292	if (!rl_outstream)
293		rl_outstream = stdout;
294
295	/*
296	 * See if we don't really want to run the editor
297	 */
298	if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
299		editmode = 0;
300
301	e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
302
303	if (!editmode)
304		el_set(e, EL_EDITMODE, 0);
305
306	h = history_init();
307	if (!e || !h)
308		return (-1);
309
310	history(h, &ev, H_SETSIZE, INT_MAX);	/* unlimited */
311	history_length = 0;
312	max_input_history = INT_MAX;
313	el_set(e, EL_HIST, history, h);
314
315	/* Setup resize function */
316	el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
317
318	/* setup getc function if valid */
319	if (rl_getc_function)
320		el_set(e, EL_GETCFN, _getc_function);
321
322	/* for proper prompt printing in readline() */
323	if (rl_set_prompt("") == -1) {
324		history_end(h);
325		el_end(e);
326		return -1;
327	}
328	el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
329	el_set(e, EL_SIGNAL, rl_catch_signals);
330
331	/* set default mode to "emacs"-style and read setting afterwards */
332	/* so this can be overriden */
333	el_set(e, EL_EDITOR, "emacs");
334	if (rl_terminal_name != NULL)
335		el_set(e, EL_TERMINAL, rl_terminal_name);
336	else
337		el_get(e, EL_TERMINAL, &rl_terminal_name);
338
339	/*
340	 * Word completion - this has to go AFTER rebinding keys
341	 * to emacs-style.
342	 */
343	el_set(e, EL_ADDFN, "rl_complete",
344	    "ReadLine compatible completion function",
345	    _el_rl_complete);
346	el_set(e, EL_BIND, "^I", "rl_complete", NULL);
347
348	/*
349	 * Send TSTP when ^Z is pressed.
350	 */
351	el_set(e, EL_ADDFN, "rl_tstp",
352	    "ReadLine compatible suspend function",
353	    _el_rl_tstp);
354	el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
355
356	/* read settings from configuration file */
357	el_source(e, NULL);
358
359	/*
360	 * Unfortunately, some applications really do use rl_point
361	 * and rl_line_buffer directly.
362	 */
363	_resize_fun(e, &rl_line_buffer);
364	_rl_update_pos();
365
366	if (rl_startup_hook)
367		(*rl_startup_hook)(NULL, 0);
368
369	return (0);
370}
371
372
373/*
374 * read one line from input stream and return it, chomping
375 * trailing newline (if there is any)
376 */
377char *
378readline(const char *p)
379{
380	HistEvent ev;
381	const char * volatile prompt = p;
382	int count;
383	const char *ret;
384	char *buf;
385	static int used_event_hook;
386
387	if (e == NULL || h == NULL)
388		rl_initialize();
389
390	rl_done = 0;
391
392	(void)setjmp(topbuf);
393
394	/* update prompt accordingly to what has been passed */
395	if (rl_set_prompt(prompt) == -1)
396		return NULL;
397
398	if (rl_pre_input_hook)
399		(*rl_pre_input_hook)(NULL, 0);
400
401	if (rl_event_hook && !(e->el_flags&NO_TTY)) {
402		el_set(e, EL_GETCFN, _rl_event_read_char);
403		used_event_hook = 1;
404	}
405
406	if (!rl_event_hook && used_event_hook) {
407		el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
408		used_event_hook = 0;
409	}
410
411	rl_already_prompted = 0;
412
413	/* get one line from input stream */
414	ret = el_gets(e, &count);
415
416	if (ret && count > 0) {
417		int lastidx;
418
419		buf = strdup(ret);
420		if (buf == NULL)
421			return NULL;
422		lastidx = count - 1;
423		if (buf[lastidx] == '\n')
424			buf[lastidx] = '\0';
425	} else
426		buf = NULL;
427
428	history(h, &ev, H_GETSIZE);
429	history_length = ev.num;
430
431	return buf;
432}
433
434/*
435 * history functions
436 */
437
438/*
439 * is normally called before application starts to use
440 * history expansion functions
441 */
442void
443using_history(void)
444{
445	if (h == NULL || e == NULL)
446		rl_initialize();
447}
448
449
450/*
451 * substitute ``what'' with ``with'', returning resulting string; if
452 * globally == 1, substitutes all occurrences of what, otherwise only the
453 * first one
454 */
455static char *
456_rl_compat_sub(const char *str, const char *what, const char *with,
457    int globally)
458{
459	const	char	*s;
460	char	*r, *result;
461	size_t	len, with_len, what_len;
462
463	len = strlen(str);
464	with_len = strlen(with);
465	what_len = strlen(what);
466
467	/* calculate length we need for result */
468	s = str;
469	while (*s) {
470		if (*s == *what && !strncmp(s, what, what_len)) {
471			len += with_len - what_len;
472			if (!globally)
473				break;
474			s += what_len;
475		} else
476			s++;
477	}
478	r = result = malloc(len + 1);
479	if (result == NULL)
480		return NULL;
481	s = str;
482	while (*s) {
483		if (*s == *what && !strncmp(s, what, what_len)) {
484			(void)strncpy(r, with, with_len);
485			r += with_len;
486			s += what_len;
487			if (!globally) {
488				(void)strcpy(r, s);
489				return(result);
490			}
491		} else
492			*r++ = *s++;
493	}
494	*r = '\0';
495	return(result);
496}
497
498static	char	*last_search_pat;	/* last !?pat[?] search pattern */
499static	char	*last_search_match;	/* last !?pat[?] that matched */
500
501const char *
502get_history_event(const char *cmd, int *cindex, int qchar)
503{
504	int idx, sign, sub, num, begin, ret;
505	size_t len;
506	char	*pat;
507	const char *rptr;
508	HistEvent ev;
509
510	idx = *cindex;
511	if (cmd[idx++] != history_expansion_char)
512		return(NULL);
513
514	/* find out which event to take */
515	if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
516		if (history(h, &ev, H_FIRST) != 0)
517			return(NULL);
518		*cindex = cmd[idx]? (idx + 1):idx;
519		return ev.str;
520	}
521	sign = 0;
522	if (cmd[idx] == '-') {
523		sign = 1;
524		idx++;
525	}
526
527	if ('0' <= cmd[idx] && cmd[idx] <= '9') {
528		HIST_ENTRY *rl_he;
529
530		num = 0;
531		while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
532			num = num * 10 + cmd[idx] - '0';
533			idx++;
534		}
535		if (sign)
536			num = history_length - num + 1;
537
538		if (!(rl_he = history_get(num)))
539			return(NULL);
540
541		*cindex = idx;
542		return(rl_he->line);
543	}
544	sub = 0;
545	if (cmd[idx] == '?') {
546		sub = 1;
547		idx++;
548	}
549	begin = idx;
550	while (cmd[idx]) {
551		if (cmd[idx] == '\n')
552			break;
553		if (sub && cmd[idx] == '?')
554			break;
555		if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
556				    || cmd[idx] == '\t' || cmd[idx] == qchar))
557			break;
558		idx++;
559	}
560	len = idx - begin;
561	if (sub && cmd[idx] == '?')
562		idx++;
563	if (sub && len == 0 && last_search_pat && *last_search_pat)
564		pat = last_search_pat;
565	else if (len == 0)
566		return(NULL);
567	else {
568		if ((pat = malloc(len + 1)) == NULL)
569			return NULL;
570		(void)strncpy(pat, cmd + begin, len);
571		pat[len] = '\0';
572	}
573
574	if (history(h, &ev, H_CURR) != 0) {
575		if (pat != last_search_pat)
576			free(pat);
577		return (NULL);
578	}
579	num = ev.num;
580
581	if (sub) {
582		if (pat != last_search_pat) {
583			if (last_search_pat)
584				free(last_search_pat);
585			last_search_pat = pat;
586		}
587		ret = history_search(pat, -1);
588	} else
589		ret = history_search_prefix(pat, -1);
590
591	if (ret == -1) {
592		/* restore to end of list on failed search */
593		history(h, &ev, H_FIRST);
594		(void)fprintf(rl_outstream, "%s: Event not found\n", pat);
595		if (pat != last_search_pat)
596			free(pat);
597		return(NULL);
598	}
599
600	if (sub && len) {
601		if (last_search_match && last_search_match != pat)
602			free(last_search_match);
603		last_search_match = pat;
604	}
605
606	if (pat != last_search_pat)
607		free(pat);
608
609	if (history(h, &ev, H_CURR) != 0)
610		return(NULL);
611	*cindex = idx;
612	rptr = ev.str;
613
614	/* roll back to original position */
615	(void)history(h, &ev, H_SET, num);
616
617	return rptr;
618}
619
620/*
621 * the real function doing history expansion - takes as argument command
622 * to do and data upon which the command should be executed
623 * does expansion the way I've understood readline documentation
624 *
625 * returns 0 if data was not modified, 1 if it was and 2 if the string
626 * should be only printed and not executed; in case of error,
627 * returns -1 and *result points to NULL
628 * it's callers responsibility to free() string returned in *result
629 */
630static int
631_history_expand_command(const char *command, size_t offs, size_t cmdlen,
632    char **result)
633{
634	char *tmp, *search = NULL, *aptr;
635	const char *ptr, *cmd;
636	static char *from = NULL, *to = NULL;
637	int start, end, idx, has_mods = 0;
638	int p_on = 0, g_on = 0;
639
640	*result = NULL;
641	aptr = NULL;
642	ptr = NULL;
643
644	/* First get event specifier */
645	idx = 0;
646
647	if (strchr(":^*$", command[offs + 1])) {
648		char str[4];
649		/*
650		* "!:" is shorthand for "!!:".
651		* "!^", "!*" and "!$" are shorthand for
652		* "!!:^", "!!:*" and "!!:$" respectively.
653		*/
654		str[0] = str[1] = '!';
655		str[2] = '0';
656		ptr = get_history_event(str, &idx, 0);
657		idx = (command[offs + 1] == ':')? 1:0;
658		has_mods = 1;
659	} else {
660		if (command[offs + 1] == '#') {
661			/* use command so far */
662			if ((aptr = malloc(offs + 1)) == NULL)
663				return -1;
664			(void)strncpy(aptr, command, offs);
665			aptr[offs] = '\0';
666			idx = 1;
667		} else {
668			int	qchar;
669
670			qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
671			ptr = get_history_event(command + offs, &idx, qchar);
672		}
673		has_mods = command[offs + idx] == ':';
674	}
675
676	if (ptr == NULL && aptr == NULL)
677		return(-1);
678
679	if (!has_mods) {
680		*result = strdup(aptr ? aptr : ptr);
681		if (aptr)
682			free(aptr);
683		if (*result == NULL)
684			return -1;
685		return(1);
686	}
687
688	cmd = command + offs + idx + 1;
689
690	/* Now parse any word designators */
691
692	if (*cmd == '%')	/* last word matched by ?pat? */
693		tmp = strdup(last_search_match? last_search_match:"");
694	else if (strchr("^*$-0123456789", *cmd)) {
695		start = end = -1;
696		if (*cmd == '^')
697			start = end = 1, cmd++;
698		else if (*cmd == '$')
699			start = -1, cmd++;
700		else if (*cmd == '*')
701			start = 1, cmd++;
702	       else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
703			start = 0;
704			while (*cmd && '0' <= *cmd && *cmd <= '9')
705				start = start * 10 + *cmd++ - '0';
706
707			if (*cmd == '-') {
708				if (isdigit((unsigned char) cmd[1])) {
709					cmd++;
710					end = 0;
711					while (*cmd && '0' <= *cmd && *cmd <= '9')
712						end = end * 10 + *cmd++ - '0';
713				} else if (cmd[1] == '$') {
714					cmd += 2;
715					end = -1;
716				} else {
717					cmd++;
718					end = -2;
719				}
720			} else if (*cmd == '*')
721				end = -1, cmd++;
722			else
723				end = start;
724		}
725		tmp = history_arg_extract(start, end, aptr? aptr:ptr);
726		if (tmp == NULL) {
727			(void)fprintf(rl_outstream, "%s: Bad word specifier",
728			    command + offs + idx);
729			if (aptr)
730				free(aptr);
731			return(-1);
732		}
733	} else
734		tmp = strdup(aptr? aptr:ptr);
735
736	if (aptr)
737		free(aptr);
738
739	if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
740		*result = tmp;
741		return(1);
742	}
743
744	for (; *cmd; cmd++) {
745		if (*cmd == ':')
746			continue;
747		else if (*cmd == 'h') {		/* remove trailing path */
748			if ((aptr = strrchr(tmp, '/')) != NULL)
749				*aptr = '\0';
750		} else if (*cmd == 't') {	/* remove leading path */
751			if ((aptr = strrchr(tmp, '/')) != NULL) {
752				aptr = strdup(aptr + 1);
753				free(tmp);
754				tmp = aptr;
755			}
756		} else if (*cmd == 'r') {	/* remove trailing suffix */
757			if ((aptr = strrchr(tmp, '.')) != NULL)
758				*aptr = '\0';
759		} else if (*cmd == 'e') {	/* remove all but suffix */
760			if ((aptr = strrchr(tmp, '.')) != NULL) {
761				aptr = strdup(aptr);
762				free(tmp);
763				tmp = aptr;
764			}
765		} else if (*cmd == 'p')		/* print only */
766			p_on = 1;
767		else if (*cmd == 'g')
768			g_on = 2;
769		else if (*cmd == 's' || *cmd == '&') {
770			char *what, *with, delim;
771			size_t len, from_len;
772			size_t size;
773
774			if (*cmd == '&' && (from == NULL || to == NULL))
775				continue;
776			else if (*cmd == 's') {
777				delim = *(++cmd), cmd++;
778				size = 16;
779				what = realloc(from, size);
780				if (what == NULL) {
781					free(from);
782					free(tmp);
783					return 0;
784				}
785				len = 0;
786				for (; *cmd && *cmd != delim; cmd++) {
787					if (*cmd == '\\' && cmd[1] == delim)
788						cmd++;
789					if (len >= size) {
790						char *nwhat;
791						nwhat = realloc(what,
792								(size <<= 1));
793						if (nwhat == NULL) {
794							free(what);
795							free(tmp);
796							return 0;
797						}
798						what = nwhat;
799					}
800					what[len++] = *cmd;
801				}
802				what[len] = '\0';
803				from = what;
804				if (*what == '\0') {
805					free(what);
806					if (search) {
807						from = strdup(search);
808						if (from == NULL) {
809							free(tmp);
810							return 0;
811						}
812					} else {
813						from = NULL;
814						free(tmp);
815						return (-1);
816					}
817				}
818				cmd++;	/* shift after delim */
819				if (!*cmd)
820					continue;
821
822				size = 16;
823				with = realloc(to, size);
824				if (with == NULL) {
825					free(to);
826					free(tmp);
827					return -1;
828				}
829				len = 0;
830				from_len = strlen(from);
831				for (; *cmd && *cmd != delim; cmd++) {
832					if (len + from_len + 1 >= size) {
833						char *nwith;
834						size += from_len + 1;
835						nwith = realloc(with, size);
836						if (nwith == NULL) {
837							free(with);
838							free(tmp);
839							return -1;
840						}
841						with = nwith;
842					}
843					if (*cmd == '&') {
844						/* safe */
845						(void)strcpy(&with[len], from);
846						len += from_len;
847						continue;
848					}
849					if (*cmd == '\\'
850					    && (*(cmd + 1) == delim
851						|| *(cmd + 1) == '&'))
852						cmd++;
853					with[len++] = *cmd;
854				}
855				with[len] = '\0';
856				to = with;
857			}
858
859			aptr = _rl_compat_sub(tmp, from, to, g_on);
860			if (aptr) {
861				free(tmp);
862				tmp = aptr;
863			}
864			g_on = 0;
865		}
866	}
867	*result = tmp;
868	return (p_on? 2:1);
869}
870
871
872/*
873 * csh-style history expansion
874 */
875int
876history_expand(char *str, char **output)
877{
878	int ret = 0;
879	size_t idx, i, size;
880	char *tmp, *result;
881
882	if (h == NULL || e == NULL)
883		rl_initialize();
884
885	if (history_expansion_char == 0) {
886		*output = strdup(str);
887		return(0);
888	}
889
890	*output = NULL;
891	if (str[0] == history_subst_char) {
892		/* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
893		*output = malloc(strlen(str) + 4 + 1);
894		if (*output == NULL)
895			return 0;
896		(*output)[0] = (*output)[1] = history_expansion_char;
897		(*output)[2] = ':';
898		(*output)[3] = 's';
899		(void)strcpy((*output) + 4, str);
900		str = *output;
901	} else {
902		*output = strdup(str);
903		if (*output == NULL)
904			return 0;
905	}
906
907#define ADD_STRING(what, len, fr)					\
908	{								\
909		if (idx + len + 1 > size) {				\
910			char *nresult = realloc(result, (size += len + 1));\
911			if (nresult == NULL) {				\
912				free(*output);				\
913				if (/*CONSTCOND*/fr)			\
914					free(tmp);			\
915				return 0;				\
916			}						\
917			result = nresult;				\
918		}							\
919		(void)strncpy(&result[idx], what, len);			\
920		idx += len;						\
921		result[idx] = '\0';					\
922	}
923
924	result = NULL;
925	size = idx = 0;
926	tmp = NULL;
927	for (i = 0; str[i];) {
928		int qchar, loop_again;
929		size_t len, start, j;
930
931		qchar = 0;
932		loop_again = 1;
933		start = j = i;
934loop:
935		for (; str[j]; j++) {
936			if (str[j] == '\\' &&
937			    str[j + 1] == history_expansion_char) {
938				(void)strcpy(&str[j], &str[j + 1]);
939				continue;
940			}
941			if (!loop_again) {
942				if (isspace((unsigned char) str[j])
943				    || str[j] == qchar)
944					break;
945			}
946			if (str[j] == history_expansion_char
947			    && !strchr(history_no_expand_chars, str[j + 1])
948			    && (!history_inhibit_expansion_function ||
949			    (*history_inhibit_expansion_function)(str,
950			    (int)j) == 0))
951				break;
952		}
953
954		if (str[j] && loop_again) {
955			i = j;
956			qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
957			j++;
958			if (str[j] == history_expansion_char)
959				j++;
960			loop_again = 0;
961			goto loop;
962		}
963		len = i - start;
964		ADD_STRING(&str[start], len, 0);
965
966		if (str[i] == '\0' || str[i] != history_expansion_char) {
967			len = j - i;
968			ADD_STRING(&str[i], len, 0);
969			if (start == 0)
970				ret = 0;
971			else
972				ret = 1;
973			break;
974		}
975		ret = _history_expand_command (str, i, (j - i), &tmp);
976		if (ret > 0 && tmp) {
977			len = strlen(tmp);
978			ADD_STRING(tmp, len, 1);
979		}
980		if (tmp) {
981			free(tmp);
982			tmp = NULL;
983		}
984		i = j;
985	}
986
987	/* ret is 2 for "print only" option */
988	if (ret == 2) {
989		add_history(result);
990#ifdef GDB_411_HACK
991		/* gdb 4.11 has been shipped with readline, where */
992		/* history_expand() returned -1 when the line	  */
993		/* should not be executed; in readline 2.1+	  */
994		/* it should return 2 in such a case		  */
995		ret = -1;
996#endif
997	}
998	free(*output);
999	*output = result;
1000
1001	return (ret);
1002}
1003
1004/*
1005* Return a string consisting of arguments of "str" from "start" to "end".
1006*/
1007char *
1008history_arg_extract(int start, int end, const char *str)
1009{
1010	size_t  i, len, max;
1011	char	**arr, *result = NULL;
1012
1013	arr = history_tokenize(str);
1014	if (!arr)
1015		return NULL;
1016	if (arr && *arr == NULL)
1017		goto out;
1018
1019	for (max = 0; arr[max]; max++)
1020		continue;
1021	max--;
1022
1023	if (start == '$')
1024		start = (int)max;
1025	if (end == '$')
1026		end = (int)max;
1027	if (end < 0)
1028		end = (int)max + end + 1;
1029	if (start < 0)
1030		start = end;
1031
1032	if (start < 0 || end < 0 || (size_t)start > max ||
1033	    (size_t)end > max || start > end)
1034		goto out;
1035
1036	for (i = start, len = 0; i <= (size_t)end; i++)
1037		len += strlen(arr[i]) + 1;
1038	len++;
1039	result = malloc(len);
1040	if (result == NULL)
1041		goto out;
1042
1043	for (i = start, len = 0; i <= (size_t)end; i++) {
1044		(void)strcpy(result + len, arr[i]);
1045		len += strlen(arr[i]);
1046		if (i < (size_t)end)
1047			result[len++] = ' ';
1048	}
1049	result[len] = '\0';
1050
1051out:
1052	for (i = 0; arr[i]; i++)
1053		free(arr[i]);
1054	free(arr);
1055
1056	return result;
1057}
1058
1059/*
1060 * Parse the string into individual tokens,
1061 * similar to how shell would do it.
1062 */
1063char **
1064history_tokenize(const char *str)
1065{
1066	int size = 1, idx = 0, i, start;
1067	size_t len;
1068	char **result = NULL, *temp, delim = '\0';
1069
1070	for (i = 0; str[i];) {
1071		while (isspace((unsigned char) str[i]))
1072			i++;
1073		start = i;
1074		for (; str[i];) {
1075			if (str[i] == '\\') {
1076				if (str[i+1] != '\0')
1077					i++;
1078			} else if (str[i] == delim)
1079				delim = '\0';
1080			else if (!delim &&
1081				    (isspace((unsigned char) str[i]) ||
1082				strchr("()<>;&|$", str[i])))
1083				break;
1084			else if (!delim && strchr("'`\"", str[i]))
1085				delim = str[i];
1086			if (str[i])
1087				i++;
1088		}
1089
1090		if (idx + 2 >= size) {
1091			char **nresult;
1092			size <<= 1;
1093			nresult = realloc(result, size * sizeof(char *));
1094			if (nresult == NULL) {
1095				free(result);
1096				return NULL;
1097			}
1098			result = nresult;
1099		}
1100		len = i - start;
1101		temp = malloc(len + 1);
1102		if (temp == NULL) {
1103			for (i = 0; i < idx; i++)
1104				free(result[i]);
1105			free(result);
1106			return NULL;
1107		}
1108		(void)strncpy(temp, &str[start], len);
1109		temp[len] = '\0';
1110		result[idx++] = temp;
1111		result[idx] = NULL;
1112		if (str[i])
1113			i++;
1114	}
1115	return (result);
1116}
1117
1118
1119/*
1120 * limit size of history record to ``max'' events
1121 */
1122void
1123stifle_history(int max)
1124{
1125	HistEvent ev;
1126
1127	if (h == NULL || e == NULL)
1128		rl_initialize();
1129
1130	if (history(h, &ev, H_SETSIZE, max) == 0)
1131		max_input_history = max;
1132}
1133
1134
1135/*
1136 * "unlimit" size of history - set the limit to maximum allowed int value
1137 */
1138int
1139unstifle_history(void)
1140{
1141	HistEvent ev;
1142	int omax;
1143
1144	history(h, &ev, H_SETSIZE, INT_MAX);
1145	omax = max_input_history;
1146	max_input_history = INT_MAX;
1147	return (omax);		/* some value _must_ be returned */
1148}
1149
1150
1151int
1152history_is_stifled(void)
1153{
1154
1155	/* cannot return true answer */
1156	return (max_input_history != INT_MAX);
1157}
1158
1159static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1160
1161int
1162history_truncate_file (const char *filename, int nlines)
1163{
1164	int ret = 0;
1165	FILE *fp, *tp;
1166	char template[sizeof(_history_tmp_template)];
1167	char buf[4096];
1168	int fd;
1169	char *cp;
1170	off_t off;
1171	int count = 0;
1172	ssize_t left = 0;
1173
1174	if (filename == NULL && (filename = _default_history_file()) == NULL)
1175		return errno;
1176	if ((fp = fopen(filename, "r+")) == NULL)
1177		return errno;
1178	strcpy(template, _history_tmp_template);
1179	if ((fd = mkstemp(template)) == -1) {
1180		ret = errno;
1181		goto out1;
1182	}
1183
1184	if ((tp = fdopen(fd, "r+")) == NULL) {
1185		close(fd);
1186		ret = errno;
1187		goto out2;
1188	}
1189
1190	for(;;) {
1191		if (fread(buf, sizeof(buf), 1, fp) != 1) {
1192			if (ferror(fp)) {
1193				ret = errno;
1194				break;
1195			}
1196			if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1197			    (off_t)-1) {
1198				ret = errno;
1199				break;
1200			}
1201			left = fread(buf, 1, sizeof(buf), fp);
1202			if (ferror(fp)) {
1203				ret = errno;
1204				break;
1205			}
1206			if (left == 0) {
1207				count--;
1208				left = sizeof(buf);
1209			} else if (fwrite(buf, (size_t)left, 1, tp) != 1) {
1210				ret = errno;
1211				break;
1212			}
1213			fflush(tp);
1214			break;
1215		}
1216		if (fwrite(buf, sizeof(buf), 1, tp) != 1) {
1217			ret = errno;
1218			break;
1219		}
1220		count++;
1221	}
1222	if (ret)
1223		goto out3;
1224	cp = buf + left - 1;
1225	if(*cp != '\n')
1226		cp++;
1227	for(;;) {
1228		while (--cp >= buf) {
1229			if (*cp == '\n') {
1230				if (--nlines == 0) {
1231					if (++cp >= buf + sizeof(buf)) {
1232						count++;
1233						cp = buf;
1234					}
1235					break;
1236				}
1237			}
1238		}
1239		if (nlines <= 0 || count == 0)
1240			break;
1241		count--;
1242		if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1243			ret = errno;
1244			break;
1245		}
1246		if (fread(buf, sizeof(buf), 1, tp) != 1) {
1247			if (ferror(tp)) {
1248				ret = errno;
1249				break;
1250			}
1251			ret = EAGAIN;
1252			break;
1253		}
1254		cp = buf + sizeof(buf);
1255	}
1256
1257	if (ret || nlines > 0)
1258		goto out3;
1259
1260	if (fseeko(fp, 0, SEEK_SET) == (off_t)-1) {
1261		ret = errno;
1262		goto out3;
1263	}
1264
1265	if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1266	    (off_t)-1) {
1267		ret = errno;
1268		goto out3;
1269	}
1270
1271	for(;;) {
1272		if ((left = fread(buf, 1, sizeof(buf), tp)) == 0) {
1273			if (ferror(fp))
1274				ret = errno;
1275			break;
1276		}
1277		if (fwrite(buf, (size_t)left, 1, fp) != 1) {
1278			ret = errno;
1279			break;
1280		}
1281	}
1282	fflush(fp);
1283	if((off = ftello(fp)) > 0)
1284		(void)ftruncate(fileno(fp), off);
1285out3:
1286	fclose(tp);
1287out2:
1288	unlink(template);
1289out1:
1290	fclose(fp);
1291
1292	return ret;
1293}
1294
1295
1296/*
1297 * read history from a file given
1298 */
1299int
1300read_history(const char *filename)
1301{
1302	HistEvent ev;
1303
1304	if (h == NULL || e == NULL)
1305		rl_initialize();
1306	if (filename == NULL && (filename = _default_history_file()) == NULL)
1307		return errno;
1308	return (history(h, &ev, H_LOAD, filename) == -1 ?
1309	    (errno ? errno : EINVAL) : 0);
1310}
1311
1312
1313/*
1314 * write history to a file given
1315 */
1316int
1317write_history(const char *filename)
1318{
1319	HistEvent ev;
1320
1321	if (h == NULL || e == NULL)
1322		rl_initialize();
1323	if (filename == NULL && (filename = _default_history_file()) == NULL)
1324		return errno;
1325	return (history(h, &ev, H_SAVE, filename) == -1 ?
1326	    (errno ? errno : EINVAL) : 0);
1327}
1328
1329
1330/*
1331 * returns history ``num''th event
1332 *
1333 * returned pointer points to static variable
1334 */
1335HIST_ENTRY *
1336history_get(int num)
1337{
1338	static HIST_ENTRY she;
1339	HistEvent ev;
1340	int curr_num;
1341
1342	if (h == NULL || e == NULL)
1343		rl_initialize();
1344
1345	/* save current position */
1346	if (history(h, &ev, H_CURR) != 0)
1347		return (NULL);
1348	curr_num = ev.num;
1349
1350	/* start from the oldest */
1351	if (history(h, &ev, H_LAST) != 0)
1352		return (NULL);	/* error */
1353
1354	/* look forwards for event matching specified offset */
1355	if (history(h, &ev, H_NEXT_EVDATA, num, &she.data))
1356		return (NULL);
1357
1358	she.line = ev.str;
1359
1360	/* restore pointer to where it was */
1361	(void)history(h, &ev, H_SET, curr_num);
1362
1363	return (&she);
1364}
1365
1366
1367/*
1368 * add the line to history table
1369 */
1370int
1371add_history(const char *line)
1372{
1373	HistEvent ev;
1374
1375	if (h == NULL || e == NULL)
1376		rl_initialize();
1377
1378	(void)history(h, &ev, H_ENTER, line);
1379	if (history(h, &ev, H_GETSIZE) == 0)
1380		history_length = ev.num;
1381
1382	return (!(history_length > 0)); /* return 0 if all is okay */
1383}
1384
1385
1386/*
1387 * remove the specified entry from the history list and return it.
1388 */
1389HIST_ENTRY *
1390remove_history(int num)
1391{
1392	HIST_ENTRY *he;
1393	HistEvent ev;
1394
1395	if (h == NULL || e == NULL)
1396		rl_initialize();
1397
1398	if ((he = malloc(sizeof(*he))) == NULL)
1399		return NULL;
1400
1401	if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1402		free(he);
1403		return NULL;
1404	}
1405
1406	he->line = ev.str;
1407	if (history(h, &ev, H_GETSIZE) == 0)
1408		history_length = ev.num;
1409
1410	return he;
1411}
1412
1413
1414/*
1415 * replace the line and data of the num-th entry
1416 */
1417HIST_ENTRY *
1418replace_history_entry(int num, const char *line, histdata_t data)
1419{
1420	HIST_ENTRY *he;
1421	HistEvent ev;
1422	int curr_num;
1423
1424	if (h == NULL || e == NULL)
1425		rl_initialize();
1426
1427	/* save current position */
1428	if (history(h, &ev, H_CURR) != 0)
1429		return NULL;
1430	curr_num = ev.num;
1431
1432	/* start from the oldest */
1433	if (history(h, &ev, H_LAST) != 0)
1434		return NULL;	/* error */
1435
1436	if ((he = malloc(sizeof(*he))) == NULL)
1437		return NULL;
1438
1439	/* look forwards for event matching specified offset */
1440	if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1441		goto out;
1442
1443	he->line = strdup(ev.str);
1444	if (he->line == NULL)
1445		goto out;
1446
1447	if (history(h, &ev, H_REPLACE, line, data))
1448		goto out;
1449
1450	/* restore pointer to where it was */
1451	if (history(h, &ev, H_SET, curr_num))
1452		goto out;
1453
1454	return he;
1455out:
1456	free(he);
1457	return NULL;
1458}
1459
1460/*
1461 * clear the history list - delete all entries
1462 */
1463void
1464clear_history(void)
1465{
1466	HistEvent ev;
1467
1468	(void)history(h, &ev, H_CLEAR);
1469	history_length = 0;
1470}
1471
1472
1473/*
1474 * returns offset of the current history event
1475 */
1476int
1477where_history(void)
1478{
1479	HistEvent ev;
1480	int curr_num, off;
1481
1482	if (history(h, &ev, H_CURR) != 0)
1483		return (0);
1484	curr_num = ev.num;
1485
1486	(void)history(h, &ev, H_FIRST);
1487	off = 1;
1488	while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1489		off++;
1490
1491	return (off);
1492}
1493
1494
1495/*
1496 * returns current history event or NULL if there is no such event
1497 */
1498HIST_ENTRY *
1499current_history(void)
1500{
1501
1502	return (_move_history(H_CURR));
1503}
1504
1505
1506/*
1507 * returns total number of bytes history events' data are using
1508 */
1509int
1510history_total_bytes(void)
1511{
1512	HistEvent ev;
1513	int curr_num;
1514	size_t size;
1515
1516	if (history(h, &ev, H_CURR) != 0)
1517		return (-1);
1518	curr_num = ev.num;
1519
1520	(void)history(h, &ev, H_FIRST);
1521	size = 0;
1522	do
1523		size += strlen(ev.str) * sizeof(*ev.str);
1524	while (history(h, &ev, H_NEXT) == 0);
1525
1526	/* get to the same position as before */
1527	history(h, &ev, H_PREV_EVENT, curr_num);
1528
1529	return (int)(size);
1530}
1531
1532
1533/*
1534 * sets the position in the history list to ``pos''
1535 */
1536int
1537history_set_pos(int pos)
1538{
1539	HistEvent ev;
1540	int curr_num;
1541
1542	if (pos >= history_length || pos < 0)
1543		return (-1);
1544
1545	(void)history(h, &ev, H_CURR);
1546	curr_num = ev.num;
1547
1548	/*
1549	 * use H_DELDATA to set to nth history (without delete) by passing
1550	 * (void **)-1
1551	 */
1552	if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1553		(void)history(h, &ev, H_SET, curr_num);
1554		return(-1);
1555	}
1556	return (0);
1557}
1558
1559
1560/*
1561 * returns previous event in history and shifts pointer accordingly
1562 */
1563HIST_ENTRY *
1564previous_history(void)
1565{
1566
1567	return (_move_history(H_PREV));
1568}
1569
1570
1571/*
1572 * returns next event in history and shifts pointer accordingly
1573 */
1574HIST_ENTRY *
1575next_history(void)
1576{
1577
1578	return (_move_history(H_NEXT));
1579}
1580
1581
1582/*
1583 * searches for first history event containing the str
1584 */
1585int
1586history_search(const char *str, int direction)
1587{
1588	HistEvent ev;
1589	const char *strp;
1590	int curr_num;
1591
1592	if (history(h, &ev, H_CURR) != 0)
1593		return (-1);
1594	curr_num = ev.num;
1595
1596	for (;;) {
1597		if ((strp = strstr(ev.str, str)) != NULL)
1598			return (int) (strp - ev.str);
1599		if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1600			break;
1601	}
1602	(void)history(h, &ev, H_SET, curr_num);
1603	return (-1);
1604}
1605
1606
1607/*
1608 * searches for first history event beginning with str
1609 */
1610int
1611history_search_prefix(const char *str, int direction)
1612{
1613	HistEvent ev;
1614
1615	return (history(h, &ev, direction < 0 ?
1616	    H_PREV_STR : H_NEXT_STR, str));
1617}
1618
1619
1620/*
1621 * search for event in history containing str, starting at offset
1622 * abs(pos); continue backward, if pos<0, forward otherwise
1623 */
1624/* ARGSUSED */
1625int
1626history_search_pos(const char *str,
1627		   int direction __attribute__((__unused__)), int pos)
1628{
1629	HistEvent ev;
1630	int curr_num, off;
1631
1632	off = (pos > 0) ? pos : -pos;
1633	pos = (pos > 0) ? 1 : -1;
1634
1635	if (history(h, &ev, H_CURR) != 0)
1636		return (-1);
1637	curr_num = ev.num;
1638
1639	if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1640		return (-1);
1641
1642	for (;;) {
1643		if (strstr(ev.str, str))
1644			return (off);
1645		if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1646			break;
1647	}
1648
1649	/* set "current" pointer back to previous state */
1650	(void)history(h, &ev,
1651	    pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1652
1653	return (-1);
1654}
1655
1656
1657/********************************/
1658/* completion functions */
1659
1660char *
1661tilde_expand(char *name)
1662{
1663	return fn_tilde_expand(name);
1664}
1665
1666char *
1667filename_completion_function(const char *name, int state)
1668{
1669	return fn_filename_completion_function(name, state);
1670}
1671
1672/*
1673 * a completion generator for usernames; returns _first_ username
1674 * which starts with supplied text
1675 * text contains a partial username preceded by random character
1676 * (usually '~'); state is ignored
1677 * it's callers responsibility to free returned value
1678 */
1679char *
1680username_completion_function(const char *text, int state)
1681{
1682	struct passwd *pwd;
1683
1684	if (text[0] == '\0')
1685		return (NULL);
1686
1687	if (*text == '~')
1688		text++;
1689
1690	if (state == 0)
1691		setpwent();
1692
1693   while ((pwd = getpwent())
1694		&& pwd != NULL && text[0] == pwd->pw_name[0]
1695		&& strcmp(text, pwd->pw_name) == 0);
1696
1697	if (pwd == NULL) {
1698		endpwent();
1699		return NULL;
1700	}
1701	return strdup(pwd->pw_name);
1702}
1703
1704
1705/*
1706 * el-compatible wrapper to send TSTP on ^Z
1707 */
1708/* ARGSUSED */
1709static unsigned char
1710_el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1711{
1712	(void)kill(0, SIGTSTP);
1713	return CC_NORM;
1714}
1715
1716/*
1717 * Display list of strings in columnar format on readline's output stream.
1718 * 'matches' is list of strings, 'len' is number of strings in 'matches',
1719 * 'max' is maximum length of string in 'matches'.
1720 */
1721void
1722rl_display_match_list(char **matches, int len, int max)
1723{
1724
1725	fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1726}
1727
1728static const char *
1729/*ARGSUSED*/
1730_rl_completion_append_character_function(const char *dummy
1731    __attribute__((__unused__)))
1732{
1733	static char buf[2];
1734	buf[0] = rl_completion_append_character;
1735	buf[1] = '\0';
1736	return buf;
1737}
1738
1739
1740/*
1741 * complete word at current point
1742 */
1743/* ARGSUSED */
1744int
1745rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1746{
1747#ifdef WIDECHAR
1748	static ct_buffer_t wbreak_conv, sprefix_conv;
1749#endif
1750
1751	if (h == NULL || e == NULL)
1752		rl_initialize();
1753
1754	if (rl_inhibit_completion) {
1755		char arr[2];
1756		arr[0] = (char)invoking_key;
1757		arr[1] = '\0';
1758		el_insertstr(e, arr);
1759		return (CC_REFRESH);
1760	}
1761
1762	/* Just look at how many global variables modify this operation! */
1763	return fn_complete(e,
1764	    (CPFunction *)rl_completion_entry_function,
1765	    rl_attempted_completion_function,
1766	    ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1767	    ct_decode_string(rl_special_prefixes, &sprefix_conv),
1768	    _rl_completion_append_character_function,
1769	    (size_t)rl_completion_query_items,
1770	    &rl_completion_type, &rl_attempted_completion_over,
1771	    &rl_point, &rl_end);
1772
1773
1774}
1775
1776
1777/* ARGSUSED */
1778static unsigned char
1779_el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1780{
1781	return (unsigned char)rl_complete(0, ch);
1782}
1783
1784/*
1785 * misc other functions
1786 */
1787
1788/*
1789 * bind key c to readline-type function func
1790 */
1791int
1792rl_bind_key(int c, rl_command_func_t *func)
1793{
1794	int retval = -1;
1795
1796	if (h == NULL || e == NULL)
1797		rl_initialize();
1798
1799	if (func == rl_insert) {
1800		/* XXX notice there is no range checking of ``c'' */
1801		e->el_map.key[c] = ED_INSERT;
1802		retval = 0;
1803	}
1804	return (retval);
1805}
1806
1807
1808/*
1809 * read one key from input - handles chars pushed back
1810 * to input stream also
1811 */
1812int
1813rl_read_key(void)
1814{
1815	char fooarr[2 * sizeof(int)];
1816
1817	if (e == NULL || h == NULL)
1818		rl_initialize();
1819
1820	return (el_getc(e, fooarr));
1821}
1822
1823
1824/*
1825 * reset the terminal
1826 */
1827/* ARGSUSED */
1828void
1829rl_reset_terminal(const char *p __attribute__((__unused__)))
1830{
1831
1832	if (h == NULL || e == NULL)
1833		rl_initialize();
1834	el_reset(e);
1835}
1836
1837
1838/*
1839 * insert character ``c'' back into input stream, ``count'' times
1840 */
1841int
1842rl_insert(int count, int c)
1843{
1844	char arr[2];
1845
1846	if (h == NULL || e == NULL)
1847		rl_initialize();
1848
1849	/* XXX - int -> char conversion can lose on multichars */
1850	arr[0] = c;
1851	arr[1] = '\0';
1852
1853	for (; count > 0; count--)
1854		el_push(e, arr);
1855
1856	return (0);
1857}
1858
1859int
1860rl_insert_text(const char *text)
1861{
1862	if (!text || *text == 0)
1863		return (0);
1864
1865	if (h == NULL || e == NULL)
1866		rl_initialize();
1867
1868	if (el_insertstr(e, text) < 0)
1869		return (0);
1870	return (int)strlen(text);
1871}
1872
1873/*ARGSUSED*/
1874int
1875rl_newline(int count, int c)
1876{
1877	/*
1878	 * Readline-4.0 appears to ignore the args.
1879	 */
1880	return rl_insert(1, '\n');
1881}
1882
1883/*ARGSUSED*/
1884static unsigned char
1885rl_bind_wrapper(EditLine *el, unsigned char c)
1886{
1887	if (map[c] == NULL)
1888	    return CC_ERROR;
1889
1890	_rl_update_pos();
1891
1892	(*map[c])(NULL, c);
1893
1894	/* If rl_done was set by the above call, deal with it here */
1895	if (rl_done)
1896		return CC_EOF;
1897
1898	return CC_NORM;
1899}
1900
1901int
1902rl_add_defun(const char *name, Function *fun, int c)
1903{
1904	char dest[8];
1905	if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1906		return -1;
1907	map[(unsigned char)c] = fun;
1908	el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1909	vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1910	el_set(e, EL_BIND, dest, name);
1911	return 0;
1912}
1913
1914void
1915rl_callback_read_char()
1916{
1917	int count = 0, done = 0;
1918	const char *buf = el_gets(e, &count);
1919	char *wbuf;
1920
1921	if (buf == NULL || count-- <= 0)
1922		return;
1923	if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1924		done = 1;
1925	if (buf[count] == '\n' || buf[count] == '\r')
1926		done = 2;
1927
1928	if (done && rl_linefunc != NULL) {
1929		el_set(e, EL_UNBUFFERED, 0);
1930		if (done == 2) {
1931		    if ((wbuf = strdup(buf)) != NULL)
1932			wbuf[count] = '\0';
1933		} else
1934			wbuf = NULL;
1935		(*(void (*)(const char *))rl_linefunc)(wbuf);
1936		//el_set(e, EL_UNBUFFERED, 1);
1937	}
1938}
1939
1940void
1941rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
1942{
1943	if (e == NULL) {
1944		rl_initialize();
1945	}
1946	(void)rl_set_prompt(prompt);
1947	rl_linefunc = linefunc;
1948	el_set(e, EL_UNBUFFERED, 1);
1949}
1950
1951void
1952rl_callback_handler_remove(void)
1953{
1954	el_set(e, EL_UNBUFFERED, 0);
1955	rl_linefunc = NULL;
1956}
1957
1958void
1959rl_redisplay(void)
1960{
1961	char a[2];
1962	a[0] = e->el_tty.t_c[TS_IO][C_REPRINT];
1963	a[1] = '\0';
1964	el_push(e, a);
1965}
1966
1967int
1968rl_get_previous_history(int count, int key)
1969{
1970	char a[2];
1971	a[0] = key;
1972	a[1] = '\0';
1973	while (count--)
1974		el_push(e, a);
1975	return 0;
1976}
1977
1978void
1979/*ARGSUSED*/
1980rl_prep_terminal(int meta_flag)
1981{
1982	el_set(e, EL_PREP_TERM, 1);
1983}
1984
1985void
1986rl_deprep_terminal(void)
1987{
1988	el_set(e, EL_PREP_TERM, 0);
1989}
1990
1991int
1992rl_read_init_file(const char *s)
1993{
1994	return(el_source(e, s));
1995}
1996
1997int
1998rl_parse_and_bind(const char *line)
1999{
2000	const char **argv;
2001	int argc;
2002	Tokenizer *tok;
2003
2004	tok = tok_init(NULL);
2005	tok_str(tok, line, &argc, &argv);
2006	argc = el_parse(e, argc, argv);
2007	tok_end(tok);
2008	return (argc ? 1 : 0);
2009}
2010
2011int
2012rl_variable_bind(const char *var, const char *value)
2013{
2014	/*
2015	 * The proper return value is undocument, but this is what the
2016	 * readline source seems to do.
2017	 */
2018	return ((el_set(e, EL_BIND, "", var, value) == -1) ? 1 : 0);
2019}
2020
2021void
2022rl_stuff_char(int c)
2023{
2024	char buf[2];
2025
2026	buf[0] = c;
2027	buf[1] = '\0';
2028	el_insertstr(e, buf);
2029}
2030
2031static int
2032_rl_event_read_char(EditLine *el, char *cp)
2033{
2034	int	n;
2035	ssize_t num_read = 0;
2036
2037	*cp = '\0';
2038	while (rl_event_hook) {
2039
2040		(*rl_event_hook)();
2041
2042#if defined(FIONREAD)
2043		if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2044			return(-1);
2045		if (n)
2046			num_read = read(el->el_infd, cp, 1);
2047		else
2048			num_read = 0;
2049#elif defined(F_SETFL) && defined(O_NDELAY)
2050		if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2051			return(-1);
2052		if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2053			return(-1);
2054		num_read = read(el->el_infd, cp, 1);
2055		if (fcntl(el->el_infd, F_SETFL, n))
2056			return(-1);
2057#else
2058		/* not non-blocking, but what you gonna do? */
2059		num_read = read(el->el_infd, cp, 1);
2060		return(-1);
2061#endif
2062
2063		if (num_read < 0 && errno == EAGAIN)
2064			continue;
2065		if (num_read == 0)
2066			continue;
2067		break;
2068	}
2069	if (!rl_event_hook)
2070		el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2071	return (int)num_read;
2072}
2073
2074static void
2075_rl_update_pos(void)
2076{
2077	const LineInfo *li = el_line(e);
2078
2079	rl_point = (int)(li->cursor - li->buffer);
2080	rl_end = (int)(li->lastchar - li->buffer);
2081}
2082
2083void
2084rl_get_screen_size(int *rows, int *cols)
2085{
2086	if (rows)
2087		el_get(e, EL_GETTC, "li", rows);
2088	if (cols)
2089		el_get(e, EL_GETTC, "co", cols);
2090}
2091
2092void
2093rl_set_screen_size(int rows, int cols)
2094{
2095	char buf[64];
2096	(void)snprintf(buf, sizeof(buf), "%d", rows);
2097	el_set(e, EL_SETTC, "li", buf);
2098	(void)snprintf(buf, sizeof(buf), "%d", cols);
2099	el_set(e, EL_SETTC, "co", buf);
2100}
2101
2102char **
2103rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2104{
2105	size_t len, max, i, j, min;
2106	char **list, *match, *a, *b;
2107
2108	len = 1;
2109	max = 10;
2110	if ((list = malloc(max * sizeof(*list))) == NULL)
2111		return NULL;
2112
2113	while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2114		list[len++] = match;
2115		if (len == max) {
2116			char **nl;
2117			max += 10;
2118			if ((nl = realloc(list, max * sizeof(*nl))) == NULL)
2119				goto out;
2120			list = nl;
2121		}
2122	}
2123	if (len == 1)
2124		goto out;
2125	list[len] = NULL;
2126	if (len == 2) {
2127		if ((list[0] = strdup(list[1])) == NULL)
2128			goto out;
2129		return list;
2130	}
2131	qsort(&list[1], len - 1, sizeof(*list),
2132	    (int (*)(const void *, const void *)) strcmp);
2133	min = SIZE_T_MAX;
2134	for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2135		b = list[i + 1];
2136		for (j = 0; a[j] && a[j] == b[j]; j++)
2137			continue;
2138		if (min > j)
2139			min = j;
2140	}
2141	if (min == 0 && *str) {
2142		if ((list[0] = strdup(str)) == NULL)
2143			goto out;
2144	} else {
2145		if ((list[0] = malloc(min + 1)) == NULL)
2146			goto out;
2147		(void)memcpy(list[0], list[1], min);
2148		list[0][min] = '\0';
2149	}
2150	return list;
2151
2152out:
2153	free(list);
2154	return NULL;
2155}
2156
2157char *
2158rl_filename_completion_function (const char *text, int state)
2159{
2160	return fn_filename_completion_function(text, state);
2161}
2162
2163void
2164rl_forced_update_display(void)
2165{
2166	el_set(e, EL_REFRESH);
2167}
2168
2169int
2170_rl_abort_internal(void)
2171{
2172	el_beep(e);
2173	longjmp(topbuf, 1);
2174	/*NOTREACHED*/
2175}
2176
2177int
2178_rl_qsort_string_compare(char **s1, char **s2)
2179{
2180	return strcoll(*s1, *s2);
2181}
2182
2183HISTORY_STATE *
2184history_get_history_state(void)
2185{
2186	HISTORY_STATE *hs;
2187
2188	if ((hs = malloc(sizeof(HISTORY_STATE))) == NULL)
2189		return (NULL);
2190	hs->length = history_length;
2191	return (hs);
2192}
2193
2194int
2195/*ARGSUSED*/
2196rl_kill_text(int from, int to)
2197{
2198	return 0;
2199}
2200
2201Keymap
2202rl_make_bare_keymap(void)
2203{
2204	return NULL;
2205}
2206
2207Keymap
2208rl_get_keymap(void)
2209{
2210	return NULL;
2211}
2212
2213void
2214/*ARGSUSED*/
2215rl_set_keymap(Keymap k)
2216{
2217}
2218
2219int
2220/*ARGSUSED*/
2221rl_generic_bind(int type, const char * keyseq, const char * data, Keymap k)
2222{
2223	return 0;
2224}
2225
2226int
2227/*ARGSUSED*/
2228rl_bind_key_in_map(int key, rl_command_func_t *fun, Keymap k)
2229{
2230	return 0;
2231}
2232
2233/* unsupported, but needed by python */
2234void
2235rl_cleanup_after_signal(void)
2236{
2237}
2238
2239int
2240rl_on_new_line(void)
2241{
2242	return 0;
2243}
2244